read a file, print char & byte count using nodejs

char_byte_count.js

const fs = require('fs');

fs.readFile('content.txt', 'utf-8', (err, data) => {
	if (err) {
		console.log(err)
		return;
	}
	let charsCount = 0;
	let totalBytes = 0
	Array.from(data).forEach(char => {
		const bytes = Buffer.byteLength(char)
		const specialChars = new Map([
			[" ", "space"],
			["\n", "newline"]
		])
		console.log(specialChars.has(char) ? specialChars.get(char) : char, char.codePointAt(0), bytes)
		totalBytes += bytes
		charsCount++
	})
	console.log({ totalBytes, charsCount })
})

content.txt

さようなら
你还好吗